To save the world and our future, Sigma Force must embark on a dangerous odyssey into an ancient past whose horrors are all too present in this page-turning thriller from #1New York Timesbestselling author James Rollins that combines cutting-edge science, historical mystery, mythology, and pulse-pounding action.For eons, the city of Troywhose legendary fall was detailed in Homers Iliadwas believed to be myth, until archaeologists in the nineteenth century uncovered its ancient walls buried beneath the sands. If Troy was real, how much of Homers twin tales of gods and monsters, curses and miracles The Iliadand The Odysseycould also be true and awaiting discovery?In the frozen tundra of Greenland, a group of modern-dayresearchersstumble on a shocking find: a medieval ship buried a half-mile below the ice. The ships hold contains a collection of even older artifactstools of wardating back to the Bronze Age. Inside the captains cabin is a magnificent treasure that is as priceless as it is miraculous: a clockwork goldmapimbedded withan intricate silver astrolabe. The mechanismwas crafted by a group of Muslim inventorsthe Ban Ms brothersconsidered by many to be the Da Vincisof the Arab worldbrilliantscientistswho inspired Leonardos own work.Once activated, the moving map traces the path of Odysseuss famous ship as it sailed away from Troy. But the route detours as the map opens to reveal a fiery river leading to a hidden realm underneath the Mediterranean Sea. It is the subterranean world of Tartarus, the Greek name for Hell. In mythology, Tartarus was where the wicked were punished and the monstrous Titans of old, imprisoned.When word of Tartarus spreadsand of the cache of miraculous weapons said to be hidden theretensions explode in this volatile region where Turks battle Kurds, terrorists wage war, and civilians suffer untold horrors. The phantasmagoric horrors found in Homers tales are all too realand could be unleashed upon the world. Whoever possesses them can use their awesome power to control the future of humanity.Now, Sigma Force must go where humans fear to tread. To prevent a tyrant from igniting a global war, they must cross the very gates of Hell.